Rocella vigilans Fenner (1984)
Comment: Two valves that happened to settle together on a slide. Note the falt valve faces and twin rimoportulae located within the central opening in the upper valve.
Locality: Deep Sea Drilling Project Hole 513A (Mid-Atlantic Ridge, south Atlantic), sample: 71-513A-18-2, 142-143 cm (early Oligocene).
Photographed using: Zeiss Axio.A1, Plan-APOCHROMAT 100×/1.4 Oil DIC + Zeiss AxioCam ICc 5. Stacked using Helicon Focus.
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